KR20050102841A - An iris apparatus and a driving apparatus for iris and camera unit having the same and method to control the iris apparatus - Google Patents

Abstract

At least one lens shutter for controlling the amount of incident light by opening and closing the optical path according to the moving position; It is installed so as to move independently with respect to the lens shutter, at least one ND filter for reducing the amount of incident light on the optical path according to the movement position.

Description

Aperture device and aperture driving device, and camera unit and aperture control method having same {An iris apparatus and a driving apparatus for iris and camera unit having the same and method to control the iris apparatus}

The present invention relates to an image photographing apparatus for capturing and recording / storing image information, and more particularly, to an aperture device, an aperture driving device, and a camera unit having the same.

As an example of an image information recording / reproducing apparatus, a camcorder capable of capturing a moving image and a still image is widely used. The camcorder includes a camera unit, a signal conversion device, a deck device for recording / reproducing the captured image, a display device and the like. Such a camcorder mainly records video information photographed using a cassette tape as a recording medium. In recent years, research into a recording / reproducing apparatus for miniaturizing and lightening video information by employing a compact recording medium such as a hard disk drive has been actively conducted. The recording / playback device employing the hard disk drive does not require a deck device, which makes it possible to reduce the size and weight.

On the other hand, the camera unit is a focusing lens and a zoom lens is installed in the lens barrel is packaged as a module and installed in the main body of the product. Thus, the barrel is provided with a motor for driving the focusing lens and the zoom lens.

In addition, a lens shutter for adjusting the amount of incident light is provided in the barrel. The lens shutter adjusts the amount of incident light while the plurality of shutter members are moved by separate shutter driving motors.

According to the above configuration, a plurality of motors are provided outside the barrel, and in particular, even a lens driving motor is provided, thereby limiting the size of the camera unit.

In addition, while the shape of the barrel is generally cylindrical, there is a problem in that the design of the various angles due to the motor is installed in the outside of the barrel is inevitably designed to have a variety of restrictions.

In addition, an ND (Neutral Density) filter is provided in the barrel. This ND filter serves to reduce the amount of incident light, thereby suppressing the occurrence of diffraction phenomenon in which the resolution falls sharply at high brightness due to the optical characteristics, thereby making it possible to obtain good resolution.

By the way, according to the conventional structure, the ND filter is provided to be bonded or fastened to the lens shutter and move together with the lens shutter. Therefore, regardless of the change in the aperture of the lens, that is, the opening degree of the lens shutter, a part of the optical path is always covered by the ND filter. In this case, there is no big problem in high brightness, but at low light, there is a problem in that the amount of incident light is significantly reduced to reduce resolution.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first object of the present invention is to provide an aperture device having an improved structure to independently drive the ND filter and the lens shutter.

In addition, a second object of the present invention is to provide an aperture driving apparatus having an improved structure to drive an ND filter independently of a lens shutter.

Another object of the present invention is to provide a camera unit having a DN filter that can be driven independently of the lens shutter.

Another object of the present invention is to provide an aperture control method for individually driving a lens shutter and an ND filter.

The aperture device of the present invention for achieving the above object is provided on the optical path, at least one lens shutter for controlling the amount of incident light by opening and closing the optical path according to the movement position; And at least one ND filter which is installed to move independently of the lens shutter and reduces the amount of incident light on a path opened by the lens shutter according to the moving position.

Here, each of the lens shutter and the ND filter is installed to rotate on the optical path, and the rotation centers of the lens shutter and the ND filter are preferably the same.

The ND filter is installed so that the area covering the optical path is variable according to the moving position, and the blind area is inversely proportional to the amount of opening of the optical path.

In addition, the ND filter may be installed such that an area overlapping with the lens shutter varies according to a moving position.

A plurality of ND filters may be provided, and the plurality of ND filters may be moved independently of each other.

In addition, the plurality of ND filters has a cam slit for the rotational movement, it is preferable that the cam slit is straight.

In addition, the lens shutter may have a cam slit for the rotational movement.

In addition, the cam shutters of the lens shutter and the ND filter may be formed to overlap each other at a predetermined position.

In addition, the overlap amount of the cam slits may be inversely proportional to the opening amount of the optical path.

The aperture drive device of the present invention for achieving the second object comprises: at least one lens shutter for opening and closing the optical path; At least one ND filter installed to move independently of the lens shutter and reducing incident light incident on the open optical path; And a driving unit for driving the lens shutter and the ND filter.

Here, the drive unit, the motor housing for supporting the ND filter, the optical path; A stator assembly installed in the motor housing; Rotor is installed inside the stator assembly, the rotor for interlocking the ND filter, preferably.

In addition, the ND filter is rotatably installed in the motor housing, it is preferable to be located on the optical path according to the rotation position.

In addition, the rotor may have a driving pin for interlocking the ND filter.

The motor housing may include a shaft boss for rotatably supporting the ND filter; It is preferable to have a guide portion for guiding the movement of the drive pin.

In addition, the ND filter has a cam slit formed in a predetermined shape so as to be connected to the driving pin to be interlocked, and the cam slit may be formed in a straight shape.

In addition, the lens shutter is preferably supported by the motor housing to rotate with the same center of rotation as the ND filter.

The rotor may have a driving pin for interlocking the ND filter and the lens shutter.

Each of the ND filter and the lens shutter may include a shaft hole supported by the motor housing; It is preferable to have a cam slit interlocked by the driving pin.

Each of the cam slits of the ND filter and the lens shutter has a different shape, and the cam slits of the ND filter and the lens filter each overlap a predetermined portion according to the rotational position.

The lens shutter and the ND filter may be provided in plural numbers, respectively.

In addition, the camera unit of the present invention for achieving the above object, the lens barrel; A zoom lens module installed in the lens barrel; A focusing lens module installed in the lens barrel; At least one lens shutter installed movably between the zoom lens module and the focusing lens module, the at least one lens shutter opening and closing an incident path according to a moving position; An ND filter movably installed in the lens barrel to reduce the amount of incident light incident on the incident path; And a driving unit installed in the lens barrel and driving the lens shutter and the ND filter.

The driving unit may include a motor housing rotatably supporting the lens shutter and the ND filter and installed in the barrel; A stator assembly installed in the motor housing; The rotor is rotatably installed inside the stator assembly, and preferably includes a rotor for interlocking the lens shutter and the ND filter.

The aperture control method of the present invention for achieving the above object comprises a first step of varying the amount of incident light by moving at least one lens shutter; And moving the at least one ND filter independently of the lens shutter to reduce the incident light.

Here, the first step is preferably made in conjunction with the second step.

The first step includes a third step of reducing the amount of incident light by moving the lens shutter, and the second step includes a fourth step of increasing the amount of reduction of the incident light in inverse proportion to the third step. Good to do.

The variable amount of incident light in the first step may be in inverse proportion to the amount of decrease in incident light in the second step.

Hereinafter, an aperture device, an aperture drive device, and a camera unit according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, a camera unit according to an embodiment of the present invention includes a lens barrel 10, a zoom lens module 20 and a focusing lens module 30 installed inside the lens barrel 10, and an aperture device. 40 (hereinafter referred to as an aperture unit) and a drive unit 50 for driving the aperture unit 40.

The lens barrel 10 may have a cylindrical shape and may have a structure in which a pair of barrels 11 and 12 are coupled to each other. Among them, the objective lens module 13 is installed at the inlet 11a of the barrel 11 on the tip side. The substrate 14 having the CCD module 14a is coupled to the barrel 12 on the rear end side.

The zoom lens module 20 is installed to be movable in the lens barrel 10. That is, while moving backwards a predetermined distance in the direction parallel to the incident light (L) by the moving means not shown, the zooming operation of the subject is performed.

The focusing lens module 30 is installed to be movable in the lens barrel 10. The focusing lens module 30 is installed at the rear side of the zoom lens module 20 to perform the focusing operation of the subject. Here, the focusing lens module 30 is also retracted a predetermined distance in the direction parallel to the incident light L in the barrel 10 by a conveying means (not shown). The configuration for moving the respective modules 20, 30 can be implemented by generally known means. For example, a guide shaft for supporting the barrel 10 module 20, 30 is installed, and the module 20, 30 can be selectively moved using a lead screw rotated by a motor. Details of the means of movement of the modules 20 and 30 will not be described in further detail.

The aperture unit 40 is installed in the lens barrel 10 and is disposed between the modules 20 and 30. The aperture unit 40 is used to adjust the amount of light incident into the lens barrel 10 and is installed to move in a direction crossing the incident direction of the incident light L. As shown in FIG. The aperture unit 40 will be described in detail later.

The driving unit 50 is installed in the lens barrel 10. Referring to FIG. 2, the driving unit 50 includes a stator assembly 51, a motor housing 60, and a rotor 70 installed inside the stator assembly 51.

The stator assembly 51 is supported inside the motor housing 60. The stator assembly 51 includes a ring type bobbin 52 and first and second stator members 53 and 54 coupled to both sides of the bobbin 52.

A coil 52a is wound around the outer circumference of the bobbin 52. The coil 52a is electrically connected to an external terminal through a terminal portion 52b provided outside the bobbin 52.

Each of the first and second stator members 53 and 54 is coupled to both sides of the bobbin 52 to correspond to each other. Each stator member 53 and 54 has fixing teeth 53a and 54a provided at regular intervals in the circumferential direction, respectively. The fixed teeth 53a and 54a are seated on the inner circumference of the bobbin 52, and are arranged to be constantly staggered with each other. The inner circumference of the bobbin 52 is formed with grooves 52c and 52d on which the fixed teeth 53a and 54a are seated. The grooves 52c and 52d are also formed to cross each other. When the electrical signal is input to the coil 52a in a predetermined pattern, the fixing teeth 53a and 54a are magnetized according to the input pattern of the electrical signal to become an electromagnet. The rotor 70 may be rotated by a predetermined unit angle by a magnetic force generated between the fixed teeth 53a and 54a which become electromagnets and the rotor 70.

The rotor 70 is rotatably installed inside the stator assembly 51. The hollow H through which incident light L passes is formed in the center of this rotor 70. Thus, the rotor 70 does not have a shaft. One end of the rotor 70 is provided with a plurality of driving pins 71 for interlocking the aperture unit 40. In this embodiment, three drive pins 71 are provided at equal intervals.

In this embodiment, as shown in detail in FIG. 3, the rotor 70 has a cylindrical magnet 73 and a sleeve tube 75 and a plate 77 respectively coupled to both ends of the magnet 73. It is provided. The magnet 73 has the N pole and the S pole magnetized at regular intervals in the rotational direction. The sleeve tube 75 is the same cylindrical shape as the magnet 73, is coupled to one end of the magnet (73). A plurality of bearing accommodation grooves 75a are formed on the outer circumference of the sleeve tube 75. The bearing 78 is accommodated in the accommodating groove 75a so as to be in contact with and supported inside the motor housing 60. The plate 77 has a donut shape and is coupled to the other end of the magnet 73. The drive pins 71 protrude from the plate 77. The driving pin 71 may be provided by an insert molding method when the plate 77 is manufactured. The drive pin 71 is movably supported by the motor housing 60. The rotor 70 has a hollow inner circumference, and can be rotatably supported inside the stator assembly 51.

Meanwhile, as another embodiment, the rotor 70 may integrally form the magnet 73, the sleeve tube 75, and the plate 77. In this case, the entire rotor 70 may be formed of a magnet material, and the driving pin 71 may be integrally formed by an insert molding method at the same time.

The motor housing 60 is fixed inside the lens barrel 10. The motor housing 60 includes a first housing 61 and a second housing 65 which enclose and accommodate the outside of the stator assembly 51.

The first housing 61 supports the bearing 78 of the rotor 70. Specifically, the first housing 61 is coupled to cover the second stator member 54, as shown in FIGS. 2 and 3. The first housing 61 may be divided into front and rear brackets 62 and 63 coupled to each other. Each of the brackets 62 and 63 is manufactured separately and coupled together to the second stator member 54 side. Guide grooves for guiding the movement of the bearing 78 may be naturally provided at the boundaries of the brackets 62 and 63. That is, when the rotor 70 rotates, the bearing 78 supports the rotor 70 while being guided along the boundary of each bracket 62, 63. Of course, each of the brackets 62 and 63 may be integrally formed. In this case, the guide groove of the bearing 78 may be formed on the inner circumference of the first housing integrally formed.

The second housing 65 is coupled to the other side of the first housing 61 with the stator assembly 51 interposed therebetween. The second housing 65 has an opening and closing hole 65a that is opened and closed by the aperture unit 40 at the center thereof. A plurality of guide slits 65b on which the driving pins 71 are movably supported are formed around the opening and closing hole 65a. Each guide slit 65b is formed to have a length corresponding to the rotation angle of the rotor 70. The driving pin 71 is supported while being inserted into the guide slit 65b and moves along the guide slit 65b when the rotor 70 rotates.

In addition, a plurality of shaft bosses 65c are provided in the second housing 65. The axial boss 65c is provided at a position spaced apart as far as possible from the opening and closing hole 65a. Therefore, even if the aperture unit 40 is rotated at a small angle about the shaft boss 65c, the opening and closing operation of the opening and closing hole 65a is possible.

The aperture unit 40 includes a plurality of lens shutters 41, 42, 43, and a plurality of ND (Neutral Density) filters 45, 46. The lens shutters 41, 42, and 43 adjust the amount of incident light by opening and closing the opening and closing holes 65a of the first housing 65 according to the moving position.

Referring to FIG. 4, the three lens shutters 41, 42, and 43 have shaft holes 41 a, 42 a, and 43 a coupled to the shaft boss 65 c, and drive pins to be interlocked by the driving pins 71. The cam slit 41b, 42b, 43b to which 71 is fitted is provided. The individual shutters 41, 42 and 3 have the same shape and size. Therefore, when the driving pin 71 rotates and moves along the cam slits 41b, 42b, and 43b, the shutter shutters 41, 42, and 43 simultaneously rotate and interlock to selectively open and close the opening and closing holes 65a. . The cam slits 41b, 42b, and 43b are formed in a straight line and have a predetermined length.

The linear cam slits 41b, 42b, and 43b can adjust the opening and closing amount of the lens shutter 40, that is, the f number of incident light, by appropriately controlling the rotation angle of the rotor 70. .

The ND filters 45 and 46 are rotatably installed in the first motor housing 65. The ND filters 45 and 46 reduce the amount of light incident on the optical path opened by the lens shutters 41, 42 and 43 according to the rotational position. Each of the ND filters 45 and 46 has the same shape. Each of the ND filters 45 and 46 has shaft holes 45a and 46a coupled to the shaft boss 65c and cam slits 45b and 46b. That is, the ND filters 45 and 46 are installed to have the same center of rotation in each of the predetermined shutters 41 and 42 among the lens shutters 41, 42 and 43. The ND filters 45 and 46 overlap with the lens shutters 41 and 42 by a predetermined area, and are independently moved. Drive pins 71 are coupled to the cam slits 45b and 46b. Accordingly, when the rotor 70 rotates, the cam slits 45b and 46b are interlocked by the drive pins 71 so that the ND filters 45 and 46 are rotated so that the opening and closing holes 65a can be blocked or opened. do. Here, the cam slits 45b and 46b are also formed in a straight line with a predetermined length. The rotation angles of the ND filters 45 and 46 which are driven by the movement of the driving pin 71 are determined by the shape and position of the cam slits 45b and 46b similarly to the lens shutters 41, 42 and 43. Thus, for example, the cam slits 41b and 45b may be formed to overlap each other at least in some positions. In other words, when the opening and closing hole 65a is completely closed, the function of the ND filter 45 is unnecessary, and in this case, the two cam slits 41b and 45b may be formed to coincide with each other.

On the contrary, when the lens shutters 41, 42, 43 are gradually moved to open the optical path, the ND filter 45 is rotated by a smaller amount than the lens shutters 41, 42, 43 to adjust the resolution. It is desirable to reduce the amount of light incident on the open optical path. To this end, the cam slit 45b may be formed so that the amount of overlap with the other cam slit 41b decreases as the optical path, that is, the opening and closing hole 65a opens more.

In addition, the ND filters 45 and 46 are installed so that the amount overlapping with the lens shutters 41 and 42 varies depending on the rotational position. The surface area of the ND filters 45 and 46 is formed in a different shape smaller than the surface area of the lens shutters 41 and 42.

In addition, the amount of overlap of the ND filter 45 with the lens shutter 41 is made in proportion to the opening amount of the opening and closing hole 65a. That is, when the opening / closing hole 65a is completely opened, the ND filter 45 is completely covered by the lens shutter 41 and is completely out of the opening / closing hole 65a.

In addition, the two ND filters 45 and 46 may have different light transmittances. In this case, each of the ND filters 45 and 46 may cover the optical path with the same area, but may have different light transmittances. Therefore, the amount of incident light can be adjusted more precisely according to the degree of opening of the optical path.

In addition, as shown in Figure 2, the cover 80 is detachably coupled to the second housing 65 so as to prevent the separation of the aperture unit 40 is further provided. The cover 80 has a hollow 81 corresponding to the opening and closing hole 65a. The slit 83 corresponding to the guide slit 65b is formed around the hollow 81. Of course, a plurality of holes 85 corresponding to the axial bosses 65c are formed. A locking portion 87 extending to the edge of the cover 80 so as to be elastically deformed is locked to the coupling portion formed on the outer circumferential wall of the first housing 65.

In the camera unit according to the embodiment of the present invention having the above configuration, first, a process of assembling the aperture driving apparatus including the aperture unit 40 will be described.

First, the stator assembly 51 shown in FIG. 2 is assembled, and the assembled stator assembly 51 and the rotor 70 are assembled as shown in FIGS. 5A and 5B.

As shown in FIGS. 5A and 5B, the rotor 70 is interposed inside the stator assembly 51, but is not supported. Thus, as shown in FIGS. 6A and 6B, respectively, the first and second housings 61 and 65 are coupled to surround the stator assembly 51, respectively. Then, the driving pin 71 of the rotor 70 is fitted and supported by the guide slit 65b of the second housing 65. In addition, a bearing 78 installed on an outer circumference of the rotor 70 is supported by the first housing 61. 6A and 6B, when the driving unit 50 is assembled, the rotor 70 is rotatable by the length of the guide slit 65b.

When the assembly of the drive unit 50 is completed, the ND filters 45 and 46 are assembled to the drive pin 71 and the shaft boss 65c, respectively. Then, the lens shutters 41, 42, 43 are assembled to the axial bosses 65c so as to overlap the ND filters 45, 46. At this time, the lens shutters (41, 42, 43) are assembled so that a predetermined portion overlaps.

Then, as shown in FIG. 7 so that the lens shutters 41, 42, 43 and the ND filters 45, 46 assembled in the second housing 65 are not separated, the cover 80 is disposed in the second housing 65. ) To complete the assembly of the aperture driving apparatus 100.

The aperture driving device 100 assembled as described above is installed in the lens barrel 10, as shown in FIG. The assembly of the other components in the lens barrel 10, that is, the zoom lens module 20 and the focusing lens module 30, is performed through a series of known processes.

4 and 8a and 8b will be described in the opening and closing operation of the aperture unit 40.

4 shows a state in which the aperture unit 40 is completely open. That is, the shutters 41, 42, 43 and the ND filters 45, 46 do not overlap the opening / closing holes 65a, and show the open state. At this time, the ND filters 45 and 46 are completely out of the opening and closing holes 65a, and do not change the incident light amount. That is, in the state in which the aperture unit 40 is completely open, since the ND filters 45 and 46 are completely off the optical path, the resolution can be prevented from falling.

In the state of FIG. 4, when the rotor 70 is rotated by a predetermined angle, as shown in FIG. 8A, the lens shutters 41, 42, and 43 rotate by a predetermined angle to cover the opening and closing hole 65a by approximately 50%. Of course, the ND filters 45 and 46 are also rotated in conjunction with the driving pin 71, and the rotation angles thereof may be different from those of the lens shutters 41, 42 and 43. In other words, the degree of exposure of the ND filters 45 and 46 varies depending on the amount of occlusion of the opening and closing holes 65a. This is determined by the cam slits 45b and 46b of the ND filters 45 and 46, and the rotation angle can be controlled as much as the design value of the cam slits 45b and 46b.

Subsequently, when the rotor 70 is further driven to rotate, the opening and closing hole 65a is completely closed by the lens shutters 41, 42, 43 as shown in FIG. 8B. In the case of FIG. 8B, the lens shutters 41, 42, and 43 are partially overlapped with each other and driven to the center of the opening and closing hole 65a. The lens shutters 41, 42, and 43 are driven by an operation of interlocking the cam slits 41b, 42b, and 43b while the driving pins 71 provided on the rotor 70 are rotated. In the present embodiment, since the cam slits 41b, 42b, and 43b are all formed in a straight line, in order to control the opening ratio of the opening and closing hole 65a, that is, the f-number (f. No) of incident light in steps, The unit rotation angle of the rotor 70 is nonlinearly controlled. At this time, the ND filters 45 and 46 also rotate together with the driving pin 71 so as to share the movement trajectories of the lens filters 41 and 42. That is, since the ND filters 45 and 46 have straight cam slits 45b and 46b, the opening and closing holes 65a are completely opened to the ND filters 45 and 46 from the fully open state. The occlusion amount of the opening / closing hole 65a opened continuously changes, and preferably, the occlusion amount is provided in proportion to the occlusion amount of the opening and closing hole 65a. As the amount of incident light decreases, the exposed areas of the ND filters 45 and 46 are continuously varied, thereby making it possible to prevent a decrease in resolution due to diffraction characteristics. The variability and the rotation angle of the ND filters 45 and 46 can be controlled by appropriately designing the position and shape of the cam slit 45a.

According to another embodiment of the present invention, as shown in FIG. 9, the individual shutters 141, 142, and 143 have cam slits 141b, 142b, and 143b having at least a portion of which is not a straight line. As shown in FIG. 10, the cam slits 141b, 142b, and 143b may reach a value of f. No. Based on when the driving pin 71 moves at a predetermined unit angle. To determine the desired shape through the experiment. Therefore, when the rotor 70 is rotated at a constant rotation angle, the f number f. No can be controlled to a preset size. Therefore, in this embodiment, there is an advantage that can easily control the opening and closing amount of the shutters (141, 142, 143).

11 to 13, only a single ND filter 45 may be provided. In this case, the ND filter 45 is rotatably installed on the driving pin 71, has the same center of rotation as any of the lens filters 41, and is moved by the driving pin 71 at about the same time. As such, when one ND filter 45 is used, as shown in FIG. 12, the opening and closing hole 65a having the same size is different from the case of FIG. 8A using two ND filters 45 and 46. It is possible to reduce the amount of light incident to the. Of course, even when a single ND filter 45 is used, the amount of occlusion of incident light continues to change in accordance with the opening amount of the opening and closing hole 65a caused by the movement of the lens shutters 41, 42, 43.

As described above, the ND filter 45 may be configured in one or a plurality, and each of the ND filters 45 may be added so as to overlap the installation positions of the lens shutters 41, 42, and 43. Therefore, installation of the ND filter 45 is easy, and a separate drive source for driving the added ND filter 46 is unnecessary. That is, it is possible to individually control the plurality of lens shutters 41, 42, 43 and the plurality of ND filters 45, 46 by using one hollow circle.

Looking at the aperture device, the aperture drive device and the camera unit of the present invention as described above, it is possible to control the lens shutter and the ND filter to be moved independently by using a stepping motor inserted into the barrel.

Therefore, the amount of incident light can be precisely controlled by moving the ND filter independently of the lens shutter, depending on the degree of opening of the optical path. In this case, in particular, it is possible to prevent a decrease in light transmittance at low lows, thereby preventing a decrease in resolution due to diffraction.

In addition, the camera unit of the present invention is configured to drive the lens shutter and the ND filter by installing the drive unit inside the lens barrel, thereby widening the selection of the external design and miniaturizing it.

In addition, since the lens shutter and the ND filter can be directly connected to the rotor and driven, the control precision is improved and the reliability can be increased.

1 is a schematic cross-sectional view showing a camera unit according to an embodiment of the present invention.

Figure 2 is an exploded perspective view showing an extract of the aperture driving device shown in FIG.

3 is a cross-sectional view of the aperture driving device shown in FIG.

4 is a plan view showing a state in which the aperture shown in Figure 3 is coupled to the drive unit.

5A and 5B are each a perspective view showing a state in which the rotor shown in FIG. 2 is assembled to a stator assembly;

6A and 6B are perspective views each showing a state before the diaphragm is assembled in the diaphragm driving apparatus shown in FIG.

7 is a perspective view showing a combined state of the aperture driving device shown in FIG.

8A and 8B are each a plan view showing a step of operating the aperture in the state of FIG.

9 and 10 are schematic plan views showing an aperture driving apparatus according to another embodiment of the present invention.

11 to 13 each is a schematic plan view for explaining the operation of the aperture drive device according to another embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

10. Body tube 20. Zoom lens module

30. Focusing lens module 40. Aperture

41,42,43..lens shutter 45,46..ND filter

50. Drive unit 51. Stator assembly

60. Motor housing 70. Rotor

80. Cover

Claims (35)

At least one lens shutter installed on the optical path and controlling the amount of incident light by opening and closing the optical path according to a moving position; And at least one ND filter installed to move independently of the lens shutter and reducing the amount of incident light on a path opened by the lens shutter according to a moving position. The aperture device according to claim 1, wherein each of the lens shutter and the ND filter is installed to rotate on the optical path. The aperture device of claim 2, wherein the center of rotation of the lens shutter and the ND filter is the same. The aperture device of claim 1, wherein the ND filter is installed such that an area covering the optical path varies according to a moving position. The aperture device of claim 4, wherein the occlusion area is inversely proportional to the amount of opening of the optical path. The aperture device of claim 1, wherein the ND filter comprises a plurality of ND filters having different light transmittances. The iris filter of claim 1, wherein a plurality of ND filters are provided, and each of the ND filters is independently moved. The aperture device according to claim 1, wherein the ND filter is installed such that an area overlapping with the lens shutter varies according to a moving position. The aperture device of claim 1, wherein the DN filter has a cam slit for a rotational movement. 10. The diaphragm device according to claim 9, wherein the cam slit is straight. The aperture device of claim 9, wherein the lens shutter has a cam slit for a rotational motion. The aperture device of claim 11, wherein cam slits of the lens shutter and the ND filter are overlapped with each other at a predetermined position. The aperture device of claim 12, wherein an overlapping amount of the cam slits is inversely proportional to an opening amount of the optical path. At least one lens shutter for opening and closing an optical path; At least one ND filter installed to move independently of the lens shutter and reducing incident light incident on the open optical path; And a driving unit for driving the lens shutter and the ND filter. The method of claim 14, wherein the drive unit, A motor housing supporting the ND filter and providing the optical path; A stator assembly installed in the motor housing; And a rotor rotatably installed inside the stator assembly and interlocking the ND filter. The iris filter of claim 15, wherein the ND filter is rotatably installed in the motor housing and is positioned on an optical path according to a rotational position. The iris driving apparatus of claim 15, wherein the rotor has a driving pin for interlocking the ND filter. The method of claim 17, wherein the motor housing, A shaft boss for rotatably supporting the ND filter; A guide unit for guiding the movement of the drive pin; Aperture driving device of the image photographing apparatus, characterized in that it has a. The method of claim 17, wherein the ND filter, An aperture driving device of an image photographing apparatus, characterized in that it has a cam slit formed in a predetermined shape so as to be connected to the driving pin. 20. The aperture driving apparatus of claim 19, wherein the cam slit is formed in a straight shape. 17. The aperture driving apparatus of claim 16, wherein the lens shutter is supported by the motor housing to be rotated at the same center of rotation as the ND filter. The aperture driving apparatus of claim 21, wherein the rotor has a driving pin for interlocking the ND filter and the lens shutter. The method of claim 22, wherein each of the ND filter and the lens shutter, A shaft hole supported by the motor housing; And a cam slit interlocked by the driving pin. 24. The aperture driving apparatus of claim 23, wherein the cam slits of the ND filter and the lens shutter have different shapes. 24. The aperture driving apparatus of claim 23, wherein cam slits of each of the ND filter and the lens filter overlap a predetermined portion according to the rotational position. 26. The aperture driving apparatus of any one of claims 14 to 25, wherein a plurality of the lens shutter and the ND filter are provided. Lens passage; A zoom lens module installed in the lens barrel; A focusing lens module installed in the lens barrel; At least one lens shutter installed movably between the zoom lens module and the focusing lens module, the at least one lens shutter opening and closing an incident path according to a moving position; An ND filter movably installed in the lens barrel to reduce the amount of incident light incident on the incident path; And a driving unit installed in the lens barrel and driving the lens shutter and the ND filter. The method of claim 27, wherein the drive unit, A motor housing rotatably supporting the lens shutter and the ND filter and installed in the barrel; A stator assembly installed in the motor housing; And a rotor rotatably installed inside the stator assembly and interlocking the lens shutter and the ND filter. 29. The camera unit of claim 28, wherein the lens shutter and the ND filter are rotatably installed on the same axis. 30. The camera unit of claim 28 or 29, wherein the rotor has at least one driving pin for interlocking the lens shutter and the ND filter. The method of claim 30, wherein each of the lens shutter and the ND filter, A shaft player which becomes a center of rotation; And a cam slit coupled to the driving pin. A first step of varying the amount of incident light by moving at least one lens shutter; And a second step of reducing at least one incident light by moving at least one ND filter. The method of claim 32, wherein the first step, Aperture control method characterized in that made in conjunction with the second step. The method of claim 32, wherein the first step, Moving the lens shutter to reduce the amount of incident light; The second step includes a fourth step of increasing the amount of reduction of the incident light in inverse proportion to the third step. 33. The method of claim 32, wherein the variable amount of incident light in the first step is inversely proportional to the decrease in incident light in the second step.